Mill Hill Cottage Plumbing & Heating Ltd

(Previously Heating Innovations)

Automatic - Running the system on automatic with only the ground or air source heat pump operational.

With the solid fuel boiler not firing, the automatic system (ground or air source heat pump) is under the control of the programmer, just the same as any normal automatic system. Read the programmer users guide for further help.

Heat leak radiator has circuit at all times

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

Function 6.

Pumped Circuit for the Automatic Boiler when in Hot Water Mode.

With the only the ground or air source heat pump working, motorized valve no 8 is motored open to the ground or air source heat pump (closed to the solid fuel boiler). In hot water mode, motorized Valve no 10/17 is naturally open to the hot water cylinder, (closed to the radiators/U.F.H.).

When the cylinder thermostat is satisfied because the hot water in the cylinder is up to heat, the automatic boiler is switched off. (The residual heat from the pump overrun on boiler, if applicable is allowed to clear).

Programmer H/W on C/H off

Ground or air source heat pump is on.

Solid fuel appliance is not firing and cold.

Room thermostat not applicable at this stage. (Because CH is off.)

Cylinder thermostat is calling.

Bias thermostat temperature not reached (Solid fuel appliance not firing and cold)

Pumped circulation to

heat leak circuit.
hot water cylinder.

Valve Status.

	Heat Leak Diverter Valve no 1 - Electronically closed to shut off the recycling circuit around the heat leak loop.
	Motorized Valve no 22H---- Naturally closed
	Motorized Valve no 8------Motored open to the heat pump. (closed to the solid fuel boiler)
	Motorized Valve no 9----- Motored closed to shut off the gravity circuit.
	Motorized Valve no 10/17 Naturally open to the hot water cylinder. (closed to the radiators/U.F.H.)

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

Function 7.

Pumped Circuit for the ground or air source heat pump when in Hot Water and Heating Mode.

As above, but in hot water and heating mode, motorized Valve no 10/17 is motored to mid position open to the hot water cylinder and radiators/U.F.H.

Programmer H/W on C/H on

Ground or air source heat pump is on.

Solid fuel appliance is not firing and cold.

Room thermostat is calling.

Cylinder thermostat is calling.

Bias thermostat temperature not reached (Solid fuel appliance not firing and cold)

Pumped circulation to

heat leak circuit.
hot water cylinder.
radiators/U.F.H.

Valve Status.

	Heat Leak Diverter Valve no 1 - Electronically closed to shut off the recycling circuit around the heat leak loop.
	Motorized Valve no 22H---- Naturally closed
	Motorized Valve no 8------Motored open to the heat pump. (closed to the solid fuel boiler)
	Motorized Valve no 9----- Motored closed to shut off the gravity circuit.
	Motorized Valve no 10/17 Motored to mid position. open to the hot water cylinder & radiators/U.F.H..

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

Function 8.

Pumped Circuit for the ground or air source heat pump when in Heating Mode with Hot Water satisfied

When the hot water cylinder reaches optimum temperature (detected by the cylinder thermostat), motorized Valve no 10/17 is motored open to the radiators/U.F.H. and closed to the hot water cylinder.

Programmer H/W on C/H on

Ground or air source heat pump is on.

Solid fuel appliance is not firing and cold.

Room thermostat is calling.

Cylinder thermostat is satisfied.

Bias thermostat temperature not reached (Solid fuel appliance not firing and cold)

Pumped circulation to

heat leak circuit.
radiators.

Valve Status.

	Heat Leak Diverter Valve no 1 - Electronically closed to shut off the recycling circuit around the heat leak loop.
	Motorized Valve no 22H---- Naturally closed
	Motorized Valve no 8------Motored open to the heat pump. (closed to the solid fuel boiler)
	Motorized Valve no 9----- Motored closed to shut off the gravity circuit.
	Motorized Valve no 10/17 Motored open to the radiators/U.F.H. & closed to the hot water cylinder

Red = Flow. Blue = Return. Orange = Preheated Return. White = Not flowing.

Contact Mill Cottage Plumbing & Heating Ltd

Technical Support and Sales

Telephone 01354 653854